Today I received an information from a friend at HCL (a.k.a. “Wickerl” ) that attachments get lost when sending a meeting invitation to another Domino Domain. In the HCL Software Forum a user complained that this issue also occurs when sending a meeting invitation to external users.

This issue is described in SPR # SJOICG3K9F. As a workaround you can put the following NOTES.INI setting on the sending server:

ICAL_SendAsMultipartRelated=0

The problem is fixed in 12.0.2+. After upgrading to 12.0.2+ ( e.g. 12.0.2FP1 ) you can remove this NOTES.INI setting.