Can't view MSG or EML files
If you attach an email message (.msg or .eml file) to a message in Outlook synced with GSSMO or IMAP, recipients using Microsoft Exchange will not be able to read the attachment (the attachment appears blank). To avoid this issue, it's best to forward the message itself via Outlook, rather than attaching it as an .msg or .eml file.
Gmail does not convert .msg or .eml attachments. Therefore an .msg or .eml attachment sent from Outlook directly to the Gmail web UI won't be readable.
However, GSSMO automatically converts .msg and .eml attachments to a format that Gmail can read (message/rfc822 format). So an .msg or .eml attachment sent from one GSSMO user to another GSSMO user, or from a GSSMO user to the Gmail web UI, will be readable by the recipient.
|Message delivery path||Attachments readable?|
|Outlook GSSMO Google Mail Servers Gmail UI||✔|
|Outlook GSSMO Google Mail Servers GSSMO Gmail UI||✔|
|Outlook Google Mail Servers Gmail UI||✘|