Can you post your Troubleshooting Information? Help (Alt-H) - Troubleshooting Information

Application Basics

   Name: Thunderbird
   Version: 38.0.1
   User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20150608103712
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) box1047.bluehost.com:143, alwaysSTARTTLS, passwordCleartext
     OUTGOING: box1047.bluehost.com:26, alwaysSTARTTLS, passwordCleartext, true

   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

   account3:
     INCOMING: account3, , (imap) box1047.bluehost.com:143, alwaysSTARTTLS, passwordCleartext
     OUTGOING: box1047.bluehost.com:26, alwaysSTARTTLS, passwordCleartext, true

 Crash Reports
   http://crash-stats.mozilla.com/report/index/bp-61498870-d552-4fbe-b9c1-8e2382150617 (6/17/2015)
   http://crash-stats.mozilla.com/report/index/bp-a2c23707-5d6d-4fb2-a1ae-3f1162150425 (4/24/2015)

 Extensions
   Lightning, 3.3.3, false, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     browser.cache.disk.smart_size_cached_value: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     extensions.lastAppVersion: 38.0.1
     font.internaluseonly.changed: true
     font.language.group: x-unicode
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Calibri
     font.name.monospace.x-western: Calibri
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 6761f1b1-a2f9-4105-9011-8076395eb9f
     mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false…
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1434732527
     places.history.expiration.transient_current_max_pages: 104649
     plugin.importedState: true

 Graphics

     Adapter Description: Mobile Intel(R) 4 Series Express Chipset Family
     Vendor ID: 0x8086
     Device ID: 0x2a42
     Adapter RAM: Unknown
     Adapter Drivers: igdumd64 igd10umd64 igdumdx32 igd10umd32
     Driver Version: 8.15.10.1855
     Driver Date: 7-28-2009
     Direct2D Enabled: Blocked for your graphics driver version. Try updating your graphics driver to version 8.1500.1000.2202 or newer.
     DirectWrite Enabled: false (6.2.9200.17292)
     ClearType Parameters: ClearType parameters not found
     WebGL Renderer: false
     GPU Accelerated Windows: 1/1 Direct3D 11

     AzureCanvasBackend: skia
     AzureSkiaAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: cairo

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.10.8
     4.10.8

     NSS
     3.18.1 Basic ECC
     3.18.1 Basic ECC

     NSS Util
     3.18.1
     3.18.1

     NSS SSL
     3.18.1 Basic ECC
     3.18.1 Basic ECC

     NSS S/MIME
     3.18.1 Basic ECC
     3.18.1 Basic ECC

Lightning has not been updated in your case. You'll need Lightning 4.0.0.1 for Thunderbird 38. Open the Add-on Manager.

Menu button ≡ - Add-ons - Extensions

Choose 'Check for Updates' from the top-right drop-down menu (next to the search field). This should pick up and download Lightning 4.0.0.1. Restart Thunderbird when told so.

Thank you! My calendar and tasks re-appeared.

Under this updated version of Thunderbird, will my calendar now appear on my iPhone?

Thanks again for the help!

Thunderbird has got nothing to do with your iPhone. If you want to sync calendar events you'll need to set up a network calendar, e.g. like Google Calendar. Both, Thunderbird and your phone can then sync via the network calendar.

Thanks! Really appreciate the help.

When your problem has been fixed can you mark the thread as 'Solved' please? Thank you.