Collaboration in place, the next hurdle, is the user account to use. An organisational/tenant account with or without licenses, users own email registered with Microsoft: Microsoft account. In total 3 alternatives, each having its pro and cons.
- External user e.g. with a Gmail account.
Can edit documents with office web aps, no access to shared calendars or mailboxes in team rooms. Can receive copy of incoming emails to teams.
Usage: Junior partner… occasional user … external user … private user..
Problem: Creating a Microsoft account can be too much … for to many …
- Internal tenant user without license
As for External user e.g. with a Gmail account. Can edit documents with office web aps, no access to shared calendars or mailboxes in team rooms. BUT without working email… you cant even forward messages to user. Copy of incoming team email not possible.
Usage: Limited , but for permanent read only users it can be used. But sharing direcly with URL, is probably easier.
Only advantage : User receives email , with organisational id and password.
- Internal tenant user with license
All advantages, even with smallest license . Edit documents with office web aps, access to shared calendars or mailboxes in team rooms. With working email… you cant forward messages to user. And One drive is working
No wrong answer , no right answer. Depends on mix of users , internal to external, if it’s a charity or .org or .com business. Etc etc etc.. As always , need to know what you need .. then its easy to deside.