Users cannot open Outlook on different PC, empty .ost file generated

[dvrooij]

Lately, several users have been having issues opening outlook on different PC's than their own. It seems the .ost files that are generated on starting outlook are empty, giving the error '[username].ost file is not an Outlook file'.

Disabling Exchange Cached mode gives a more generic 'Network problems are preventing connections to Microsoft Exchange'. Everything works fine on their own PC (which has a working .ost file).

Below are some points I have checked:

• Mailbox not in quarantine
• autodiscover settings are set properly
• autodiscover.xml is generated as it should be
• Flushing DNS does not help
• Mapi enabled, imap and pop3 disabled
• Disabling RPC encryption does not fix
• Certificates are bound properly in IIS
• AD account inheritance is enabled
• Migrating mailboxes to different DB does not solve the issue
• Test autodiscover settings
• Exporting their mailbox in the Exchange environment properly generated a .pst file

Below is the OPMLog.log generated upon starting Outlook 2016.

2018.12.10 16:39:12 <<<< Logging Started (level is LTF_TRACE) >>>>
2018.12.10 16:39:12 HELPER::Initialize called
2018.12.10 16:39:12 Initializing: Finding a Transport
2018.12.10 16:39:12 MAPI XP Call: XPProviderInit in EMSMDB.DLL, hr = 0x00000000
2018.12.10 16:39:13 MAPI Status: (-- -- ---/--- -- ---)
2018.12.10 16:39:13 MAPI XP Call: TransportLogon, hr = 0x00000000
2018.12.10 16:39:13 Initializing: Found a transport, Error code = 0x00000000
2018.12.10 16:39:13 MAPI XP Call: AddressTypes, hr = 0x00000000, cAddrs = 3, cUids = 1
2018.12.10 16:39:13 MAPI XP Call: TransportNotify(BEGIN_IN|BEGIN_OUT), hr = 0x00000000
2018.12.10 16:39:13 HELPER::Initialize done, Error code = 0x00000000
2018.12.10 16:39:13 HELPER::GetCapabilities called, Error code = 0x00000000
2018.12.10 16:39:13 HELPER::Initialize called
2018.12.10 16:39:13 Initializing: Finding a Transport
2018.12.10 16:39:13 MAPI XP Call: XPProviderInit in EMSMDB.DLL, hr = 0x00000000
2018.12.10 16:39:13 MAPI Status: (-- -- ---/--- -- ---)
2018.12.10 16:39:13 MAPI XP Call: TransportLogon, hr = 0x00000000
2018.12.10 16:39:13 Initializing: Found a transport, Error code = 0x00000000
2018.12.10 16:39:13 MAPI XP Call: AddressTypes, hr = 0x00000000, cAddrs = 3, cUids = 1
2018.12.10 16:39:13 MAPI XP Call: TransportNotify(BEGIN_IN|BEGIN_OUT), hr = 0x00000000
2018.12.10 16:39:13 HELPER::Initialize done, Error code = 0x00000000
2018.12.10 16:39:13 HELPER::GetCapabilities called, Error code = 0x00000000


Any help would be appreciated. Thanks in advance!

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