User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322) Build Identifier: Mozilla Thunderbird 0.5+ (20040406) I have both Thunderbird 0.5 and Microsoft Outlook 97 installed on an XP Pro SP1 machine. When Thunderbird is set as the default mail handling application, three symptoms occur: 1. Outlook will no longer run. The following error message is displayed: "Outlook.exe - Ordinal Not Found ... The ordinal 36 could not be located in the dynamic link library MAPI32.dll." 2. A third party application - Motorolla PhoneTools 2.20 (version 040107002923) - can no longer access the Outlook contacts folder. It reports the following error message: "Phonebook ... Failure attempting to open c:\WINDOWS\outlook.pst file!" 3. Thunderbird cannot import the outlook address book. The following message is displayed: "Import ... Addresses successfully imported from Outlook. No Address Books were found to import." After reviewing <a href="http://groups.google.co.uk/groups? hl=en&lr=lang_en|lang_fr&ie=UTF-8&oe=UTF-8&safe=off&threadm=404694de_1% 40cnews&rnum=2&prev=/groups%3Fq%3Dmozilla%2Bthunderbird%2Bmapi32.dll%26hl%3Den% 26lr%3Dlang_en%257Clang_fr%26ie%3DUTF-8%26oe%3DUTF-8%26safe%3Doff%26selm% 3D404694de_1%2540cnews%26rnum%3D2">this thread</a> from the corel.wpoffice.wordperfect8 newsgroup, I restored my copy of mapi32.dll from the mapi32_moz_bak.dll version that Thunderbird seems to archive when it sets itself as the default mail application. All outlook functionality was restored, but Thunderbird was no longer the default mail handler. As a test, I then toggled between the two "Use Mozilla Thunderbird as the default mail application" states found under Options > General Settings, and then tested for the above symptoms. I found that the symptoms manifest whenever that switch is set. I believe this bug is related to the following two existing bugs: 234313 238567. I am not a code hacker, but I suggest that a comparisson between the version of mapi32.dll that Outlook installs, and the TB modified version, would be a good starting point for any investigation. I can provide copies of both .dll versions from my system if it will help to reproduce the bug elsewhere. Reproducible: Always Steps to Reproduce: 1. Install MS Outlook 97 2. Mozilla Thunderbird 0.5+ (20040406) 3. Launch MS Outlook and accept its offer to become the default mail handler. Close MS Outlook. 4. Launch Thunderbird and accept _its_ offer to become the default mail handler. 5. Close Thunderbird and launch Outlook for a second time. Actual Results: Outlook does not run. The following error message is displayed: "Outlook.exe - Ordinal Not Found ... The ordinal 36 could not be located in the dynamic link library MAPI32.dll.". Access to the default outlook.pst file is no longer available from Thunderbird or third-party applications. Expected Results: Outlook should launch correctly. Access to outlook.pst should be possible from Thunderbird and third-party applications. One work-around is to un-register TB as the default mail handling application.

I have just confirmed that this bug is still present in Thunderbird version 0.6 (20040502).

See in particular bug 109362 comment 26 et seq. *** This bug has been marked as a duplicate of 109362 ***