Hi,
I seem to have the issue described in https://support.microsoft.com/en-gb/kb/2855809 where certain spreadsheets are being blocked due to being unrecognised by the attachment filter. It only seems to be spreadsheets that have been created by some automated process as opposed to xlsx files created in excel, which are fine.
This was supposedly fixed in Update rollup 1 of SP3 and yet we have update rollup 7 of SP3 installed. Have we missed something, as it looks as though we've gone from SP3 > UR 4 > UR7 so skipped UR1
Has anyone got any ideas as I really don't want to add the AllowInvalidAttachment flag in the config file
Thanks
James