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Winmail.dat attachments being received by SOME users.

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Hi - I'm using Outlook 2011 for Mac. Since changing my exchange server to MS365, certain users are receiving any attachment I send as a winmail.dat file.


I need to be able to send these users attachments as part of running my business, so it's critical I just get this fixed and not have a hundred workarounds! Sending via plain text makes no difference either btw. I have compose set to html as standard though.


I use a Mac with 10.7.4


Can anyone assist with what setting needs to be changed to resolve this please?




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