Invalid ID error during Office 365 Exchange Online mailbox backup

May 28, 2025

Product Version

AhsayOBM: 7.9.0.0 - 7.15.2.2

Operating System

Windows, Mac OS X

Symptom

When performing a Office365 Exchange online backup for mailbox of large number of mail items, the following error message is received in the backup report:

No.	Type	Timestamp	Log
*	...	...	...
*	info	...	Start running post-commands
*	...	...	[List] 100% (xxxx/xxxx) Listing items from: ...
*	erro	YYYY/MM/DD hh:mm:ss	[Bptree.KeyRangeIterator.hasNext] Error=[ExchangeStandardFolder.getOrdinal] Invalid ID: 14tknLeaf=[TreeKeyNode.toString]@xxxx lBlockStart='xxxx' lNextBlockOffset='xxxx' lFirstBlockOffset='xxxx' 1LastBlockOffset='xxxx' bIsLeaf='true' lRightSiblingOffset='xxxx' sslKeys=',[TreeNode.KeyMap@xxxx] sKey='[IBptree.SimpleKey] Key='xxxx''lLeftRefBlockNo='xxxx',[TreeNode.KeyMap@xxxx]sKey='[IBptree.SimpleKey] Key='xxxx''lLeftRefBlockNo='xxxx',[TreeNode.KeyMap@xxxx] ... (truncated)
*	...	...	...

The error message above has been truncated, confirm if your backup has similar issue by searching for keywords "ExchangeStandardFolder.getOrdinal" in the backup report.

Cause

This is a known issue with AhsayOBM version 7.9.0.0 - 7.15.2.2.

Resolution

To resolve the issue, patch the AhsayOBM application to version 7.17.0.0 or above.