Email "Push" not working

[CargoMatatu]

On my SGS2 I have three email accounts: my normal email account, with check frequency set to every hour. Works fine.
My gmail account (because I HAVE to have one) but never use it, except for google accounting purposes.
And my Company email, which is an exchange account and is set to "Push". It doesn't seem to work (well, it did on the first day, but not since!).

Any suggestions, please?

 

[Rush]

Push notifications aren't guaranteed to work on anything. However, if you're having problems with your exchange email - you should delete and add back the account.