Support Moving apps to SD Memory?

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http://androidforums.com – I have a Samsung Galaxy Ace GT-S5839i where I keep getting memory nearly full messages (I am assuming that it is the Phone memory that is nearly full as there is only 17.45 MB available). The result is that I am not receiving text and emails until I move or delete something in the phone memory. I have installed a new 32 Gb microSD card so that I can move a number of Apps over to it, but when I look at the apps, the button which says 'Move App to SD' is greyed out. Is there a way to transfer these apps to the SD card? or do I have to uninstall and then re-install? Peter (General)