>Hi,
>
>I want to change the type of columns from Text to Varchar(MAX) and from Varchar(600) to Varchar(MAX). If I do so in the SSMS, could I lose some data? And if so, what is a better way to change the type of those columns (in an existing database).
>
>TIA.

You will not lose data. If you can afford it, I suggest to create a separate field, update it with the data, then drop the text field and rename the new field.