Exchange online-Deleting a group and recreating a new group with same email address and outlook cache issues

Priya Jayaraman 466 Reputation points
2026-09-05T16:33:27.6933333+00:00

Exchange online query-Deleting a group and recreating a new group with same email address.

Will this scenario bring outlook lookup issue of the deleted group from the existing outlook cache?

Cheers

Priya

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Answer accepted by question author
Jayden-P 2,680 Reputation points Independent Advisor
2026-09-05T16:42:00.8033333+00:00

Hi @Priya Jayaraman

Yes, there is a possibility that some Outlook clients may continue to reference the deleted group from their AutoComplete cache even if a new group is created with the same email address. This can result in recipient resolution or NDR issues if Outlook is using a cached LegacyExchangeDN/X500 value from the original group.

To minimize impact, users should remove any old AutoComplete entries and select the group from the Global Address List again.

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