Should pressing a sync button on the bottom right of the "All inboxes" force the email retrieval? Here is what I see:

I have 3 email providers, Gmail (primary), Yahoo, and Hotmail. Preferences in my "get mail" option is set to:
1. Gmail - "as items arrive"
2. Yahoo - "15 min"
3. Hotmail - "30 min"

For my test I have sent message to 2 of my accounts Gmail and Yahoo. While in my email client, I instantly received the Gmail account, as expected. And also, as expected I did not see the one from Yahoo. Pressing the sync button DID NOT retrieved the message that supposed to be in my Yahoo.

I switched to Yahoo inbox and upon refreshing the Yahoo inbox I see new message.
After switching back to All inbox and refreshing it, I am able to see the Yahoo email.

I did this several times just to make sure there is not any kind of timing issue of my settings and it's always consistent behavior.

So, should refresh button in the "All inbox" Synergy panel force the email retrievals without going to the the individual inboxes and and bringing them there first?