I'd be very careful as the data could well be there and you could lose it in trying to retrieve it
I'd do some Googling to see if you can find where the data is stored in your mail application, it has to be somewhere possibly in Users\"Your Name"\AppData\Roaming\Microsoft\"Whatever the name of the program is"
Personally I dislike Microsofts packages and I run Mozzila Thunderbird which, for me anyway, has been rocksolid. It includes a calender and tasks too and is (Guzzi affiliated) FREE
John