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:This is draft of a Migration Guide intended to help large organizations (also referred to as "enterprises") that use Thunderbird to upgrade to Thunderbird version 3. This initial draft is a summary of the draft author's knowledge regarding auto-sync / offline settings ({{Bug|562589}}) and Thunderbird 3 migration issues relevant to administrators (Bug 562589 {{Bug|562589#7}}) (as of 2010/05/06).
:This is draft of a Migration Guide intended to help large organizations (also referred to as "enterprises") that use Thunderbird to upgrade to Thunderbird version 3. This initial draft is a summary of the draft author's knowledge regarding auto-sync / offline settings ({{Bug|562589}}) and Thunderbird 3 migration issues relevant to administrators (Bug 562589 {{Bug|562589#7}}) (as of 2010/05/06).


;Background


This Migration Guide makes some assumptions about the typical enterprise environment:
Moved to https://developer.mozilla.org/en/Thunderbird/Deploying_Thunderbird_in_the_Enterprise/Upgrading_Thunderbird_in_the_Enterprise
 
*IMAP accounts and folders
*High mail data volume
*"Roaming profiles" or something similar are common (to support backup/recovery and mobile users)
 
(The above requirements may not be compatible with the fact that the new global search (Gloda) is enabled by default on upgrade and IMAP folder automatic synchronization is  enabled by default on upgrade. This is discussed further below.)
 
Enterprise environments typically need to perform mass software upgrades rather than upgrade software for individual users. The goals of such an an upgrade may be:
 
* To resolve bugs that exist in earlier versions
* To gain improvements in stability and reliability
* To gain improvements in performance
* To gain improvements in usability
* To minimize or make user training as simple as possible
* To minimize manpower needed to support the new, updated application
 
 
Related information:
* [[Thunderbird/Enterprise/Prefs]]
 
== Migration Guide (Thunderbird 2 To Thunderbird 3.0) ==
 
The major changes in Thunderbird 3.0 that are relevant to enterprise administrators include:
 
*Gloda (Global Search and Indexer). Enabled by default.
*Auto-sync of IMAP folders.  Enabled by default.
*Per-folder "offline use" setting of all IMAP folders is changed to "offline use=On" by default upon migration.
*"Smart Folders" is default folder pane view, even if "All Folders" is user's choice in Thunderbird 3.
 
For more detailed information about the changes between Thunderbird 2 and Thunderbird 3, see:
 
*[http://www.mozillamessaging.com/en-US/thunderbird/3.0/releasenotes/ Thunderbird Release Notes]
*[https://developer.mozilla.org/en/Thunderbird_3_for_users Thunderbird 3 for users]
*[https://developer.mozilla.org/En/Thunderbird_3_for_developers Thunderbird 3 for developers]
 
As a general rule, administrators should deal with the process of upgrading Thunderbird and enabling new features separately. That is, they should try to keep the user setup as similar as possible between Thunderbird 2 and 3 and wait until the Thunderbird 3 upgrade is complete and stable before enabling Thunderbird 3 features.
 
 
==== Disable Migration Assistant ====
 
Enterprise sites that perform mass upgrades generally want to prevent users from performing Thunderbird upgrades on their own. An upgrade dialogue in the Thunderbird Migration Assistant should be disabled. Add the following preference setting to...TODO
 
lockPref("mailnews.ui.show.migration.on.upgrade",false);
 
==== Disable Gloda(Global Search and Indexer) ====
 
 
The new Thunderbird 3 search and index functionality should be disabled because it initially impacts performance. (The indexer runs when Thunderbird 3 is first started and will continue to work until all the user's email is indexed. The more messages a user has, the longer the indexer will run.) To minimize user support workload after migration, disable Gloda before migration.
 
But how? Is it possible? Enhancement is needed?
 
==== Disable Auto-sync, Keep per folder "offline use" setting  ====
 
Auto-sync of IMAP folders is enabled by default for all IMAP accounts. The per folder "offline use" setting of all IMAP folders is changed to "offline use=On" when Thunderbird 3 is launched the first time. To keep same settings as Thunderbird 2, disable the auto-sync and offline-use settings upon upgrade.
 
To disable auto-sync:
 
lockPref("mail.server.default.autosync_offline_stores", false);
lockPref("mail.server." + serverFromAccount + ".autosync_offline_stores", false);
 
To disable per folder "offline use" setting change:
 
lockPref("mail.server." + serverFromAccount + ".offline_download", false);
lockPref("mail.server.default.autosync_offline_stores", false);
lockPref("mail.server." + serverFromAccount + ".autosync_offline_stores", false);
lockPref("mail.server." + serverFromAccount + ".offline_download", false);
 
;Hints&Tips:
 
mail.server.serverX.offline_download (default=true)
 
*When an IMAP folder is created or subscribed, set offline use=off if false, set offline use=on if true. i.e. This setting is for default of offline use=on/off of an IMAP folder.
*It's enhanced by [https://bugzilla.mozilla.org/show_bug.cgi?id=562589 bug 562589], and next meaning is added. This enhancement is already landed on Tb3.1pre and Tb3.2pre, and the enhancement has been landed on Tb 3.0.5pre today(2010/5/10).
**Upon first use of Tb 3, if serverX.offline_download=false is set before upgrade, IMAP folder's "offline use" is not touched by Migration code of Tb 3 .
 
Current behaviour of UI for auto-sync setting:
 
*Unchecked->Checked
*#Set mail.server.serverX.offline_download=true
*#Set offline use=on of all folders of the IMAP account 
*Checked->Unchecked
*#Set mail.server.serverX.offline_download=false
*#Set offline use=off of all folders of the IMAP account
 
(Note that there is a request for a design change in {{Bug|537943}}.)
 
*Gloda and auto-sync/offline-use are possibly independent, althoug relevant.
**"Download Now" button downloads mail to offline-use regardless of offline-use=On/Off.
**"Download Now" button seems to be intercepted and discarded if auto-sync is enabled and offline-use=On. It looks due to already started schedule based automatic downloading.
**Auto-sync automatically downloads mail data to offline-store if auto-sync is enabled and if offline-use=On is set in an IMAP folder.
**"Work Offline" automatcally downloads mail data to offline-store automatically, if per folder offline-use=On is set in an IMAP folder.
**Gloda indexes mail data in offline-store, if mail data is saved in offline-store, perhaps regardless of auto-sync is enabled/disabled and offline-use=On/Off and Working Online/Working Offline.
 
==== Change folder pane view to "All Folders" from "Smart Folders" ====
 
By default, Thunderbird 3 displays "Smart Folders" in the folder pane. (Smart Folders combine the messages in similarly named folders in multiple accounts, for example grouping Inbox messages from all accounts into a single Inbox on the Smart Folder pane.) If you want to preserve the default Thunderbird 2 behavior of showing "All Folders", advice users to select '''View | Folders | All''' from the menu.
 
Can "forcing Smart Folders view" upon migration be stopped?
How? Is it possible? Enhancement is needed?
Tb 3.1 won't force "Smart Folders" view(or renamed one) upon upgrade?
 
==== Considerations ====
 
===== Account definition by autoconfig =====
 
When new accounts are created, the new "autoconfig" functionality is automatically invoked. Unless users have the correct account definition parameters, it may be confusing for them to configure their own accounts (if this is permitted).
 
===== IMAP folder file location =====
 
By default, the IMAP folder file is located in each user's profile directory. If the user is storing a lot of messages for off-line access, this can result in too much data for a roaming profile. Regardless of whether or not there is a roaming profile, there may be if the profile is located on a network resource or if Microsoft Window's Offline File (CSC) is used for the offline storage file.
 
If that is the case, you have two options:
 
If the Gloda search and index is mandatory for IMAP mail data:
 
#Locate mail directory for IMAP account at location with which remote/network access won't happen(e.g. "Local Settings" of MS Win)
#Enable auto-sync, and set offline use=on of IMAP folders.
#Accept download of all mails to any PC which uses the IMAP account.
#Accept per PC thread pane column setting of the IMAP accout.
#*;:As thread pane column setting is currently saved in .msf file, and as you selected folder location other than profile directory, data in .msf can not be shared among PCs, even when you use Roaming Profile.
 
When Gloda is not needed for IMAP mail data:
 
#Locate IMAP folder file at any place you want.
#Disable auto-sync, and/or set offline use=off of all IMAP folders.
#*;:As new feature of "Disk Cache for mail in IMAP folder of offline-use=off" is added to Tb 3, mail data of viewed mail is held in far larger Disk Cache than very small memory cache of Thunderbird 2. So, frequency of problem like "repeatedly downloaded big attachment data" is reduced very much compared to Thunderbird 2.
 
As Gloda is first solution of problem of [https://bugzilla.mozilla.org/show_bug.cgi?id=383895 Bug 383895] (slowness in body text search of local mail data), and as many IMAP servers have excellent body text search functionality, consider utilizing of online search first for IMAP mail data. If online search is usable, enabling of auto-sync/offline-use merely for Gloda can be avoided.
 
===== Online search of IMAP folder =====
 
There is known problem in online search currently.
*[https://bugzilla.mozilla.org/show_bug.cgi?id=546925 Bug 546925] "Run search on server" of Edit/Find/Search Messages doesn't work.
Until the bug will be fixed, you need to use Quick Search or Virtual Folder(Saved Search folder) for online search.
 
===== Search, auto-sync, offline-use, and "Smart Folders" =====
 
If IMAP folder of offline-use=off, full text search by Gloda won't work because of offline-use=off.
 
And, if not all mails of IMAP folder of offline-use=on is downloaded into local offline-store file because of your setting for offline-store file size limitation, Gloda can't find not-downloaded mails of the IMAP folder.
 
And, as "Smart Folder" is internally Virtual Folder(Saved Search Folder), a "Smart Folder" can be Virtual Folder with multiple search target folders in mixture of local mail folders, IMAP folders of offline-use=on(all mails are sync'ed), IMAP folders of offline-use=on(not all mails are sync'ed), and IMAP folders of offline-use=off.
 
Never open bug at bugzilla.mozilla.org for "Search can't find my mail!" without sufficient checking of "what mail at what kind of folder is not hit by what kind of search at where", please.
 
== Migration Guide (Thunderbird 2 To Thunderbird 3.1) ==
(content needed)
 
== Migration Guide (Thunderbird 3.0 To Thunderbird 3.1) ==
(content needed)
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