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LainRobertson's avatar
LainRobertson
Silver Contributor
Mar 13, 2026
Solved

OAB download fails after hybrid mailbox move.

Hi folks,   I'm posting this query here as I doubt anyone in the Outlook forums would have the necessary Exchange hybrid knowledge.   I run a classic hybrid Exchange environment where Exchange Se...
  • LainRobertson's avatar
    Mar 27, 2026

    Closing this out as unexplained and possibly irrelevant/expected behaviour.

     

    I made some changes in Exchange Online and those changes were reflected in the Outlook address book inside of the expected 24 hours.

     

    While I continue to see the above errors both in the BITS queue and event logs, I am now also seeing successful transfers being logged in between.

     

    Perhaps the errors are expected - I'll probably never know, but so long as the address book is updating, I guess it doesn't matter.

     

    Cheers,

    Lain