This issue can be resolved in my opinion, as I have tested the 64 bit installer and tested a 64 bit pg4win. The current status of this is that we don't want to have different library names depending on the architecture since it is installed in the same way as linux in different directories. So there is nothing left to do here.

My suspiction with this is that here the exchange server / outlook parses the mail attachment into MAPI and somehow handles mails differently then other attachments. This automatic conversion regarding attached mails is why we always ask users in Support to send us a problematic mail as a file in a zip archive. Otherwise Exchange will convert an attached Outlook MAPI mail to MIME and on the receiving side we can no longer see the original strucutre. Similar things are probably happening on the receiving side where the MIME eml "file" is converted into a MAPIOBJECT holding the forwarded mail which then confuses our internal knowledge about the attachments causing this error.

Actually we should get rid of stdio functions and use the es_foo replacements from libgpg-error.

Well, backup and restore oddity. I don't think that that we can have a full solution here unless we provide dedicated backup and restore scripts.

This works now.

I tested it and updated the community wiki documentation to refer to it.

Still no news? :c @aheinecke

I am observing strange beavior on WIndows 10 22h2 and OL 16.0.17830.200056 even if no mail is displayed in the reading pane and the selection returns no selected mails, Outlook loads mails which are e.g. right clicked. I think a way which could prevent some problems and allow it again to change flags and categories for unselected mails would be for us to check in the Read event if the mail has some inspector and abort in that case. This could also increase compatibility with other addins. I will do some experiments with it.