Microsoft Exchange issue on my Note 2

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http://androidforums.com – Dear All I have a strange issue on my phone recently. I dont know if i have changed any setups in the phone by mistake , but now the screen lock - swipe is disabled if my microsoft exchange application is active. If i remove the account , then this swipe function is enabled and i can use pattern lock , if the exchange account is setup again , then i can use only PIN but not pattern lock. Previously this was not the issue , i was able to use pattern lock and never used PIN . Can somebody please tell me where i have done mistake? Thanks all for your support on this. Regds Mano (General)