Powershell – Last Logon Mailboxes Exchange Issues

I also tried $WarningActionPreference = "SilentlyContinue" --This will set all warning messages to silent. Looks like something is broken. Looks like there is a bug.

https://connect.microsoft.com/PowerShell/feedback/details/541500/warning-verbose-and-debug-streams-do-not-respect-action-preferences-the-way-they-should

Exchange and Sharepoint provides tools; you customize them for your needs. You might think that these needs are universal and indeed they are but you'd be surprised how much they vary between organizations so your config is likely different than others. What you are really doing is mapping business processes to the technology and that can really only be done by you. You need to figure out what your users need and build a solution that works for them. This probably explains why you aren't finding docs for exactly what you want.

Public folders are viable for Exchange 2010 and for who knows how long. Microsoft initially tried to kill them off but there was a lot of backlash so they've backed off on that a bit. If you're not already using them, you'd be wise to skip them and find a solution that uses mailboxes or Sharepoint instead.

Really your 2 options are as you've mentioned: use a mailbox and give everyone access or use a Sharepoint site. Either can work. You don't mention if you already have Sharepoint or not. If you don't, it isn't an insignificant thing to build so I'd recommend sticking with your mailbox approach which is a common solution. Obviously you need to address your issues with the permissions problems but if that's your only issue, I'd simply focus on that specific technical problem and find a solution.

I wouldn't obsess over that comment in the Microsoft doc about using resource mailboxes or Sharepoint for collaboration. A resource mailbox wouldn't be appropriate for your specific use though Sharepoint might be.