Guest vs. @rmr.cap.gov accounts

From CAPipedia

To access RMR resources, such as department continuity files, you must log in to Office 365/Teams. Unfortunately, logging in is not totally straightforward because RMR accounts are either real @rmr.cap.gov email accounts, or guest accounts.

What is a guest account?

An Office 365/Teams guest account is an account that uses an email address other than @rmr.cap.gov. For example, let's say you're a COWG member but you have an RMR duty assignment. You might have a @cowg.cap.gov account, and you only want to use that email address for all CAP business; in other words, you don't want an @rmr.cap.gov account. People in this situation must log in to RMR Office 365 as a guest account, rather than a real @rmr.cap.gov account.

Guest accounts have many of the same capabilities as real @rmr.cap.gov accounts, but there are some limitations. Here are some examples of things you can/can't do with an Office 365 guest account:

Activity Can be done with a guest Account? Can be done with an @rmr.cap.gov account?
View department files Yes Yes
Attend teams meetings Yes Yes
Host ad-hoc Teams meetings Yes Yes
Send messages to RMR mailing lists (like "IDWG Cadets") Yes Yes
Send messages to RMR mailing lists (like "IDWG Cadets") without waiting for moderation approval No Yes
Separate inbox for RMR messages (excluding non-RMR messages) No Yes