>I try to figure out how to update a table in a Access database with some changes in field length. I found that I can use table.columns.refresh() when it comes to adding or deleting fields, but what is the most convenient way to change such things as a field length?

Field (column) properties are read-only in ADOX, you would have to create a new table with the desired structure, transfer the data and drop the old table.

A simpler way of doing it is with SQL:

oCn = CreateObject("ADODB.Connection")

oCn.Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Temp\db1.mdb;")
oCn.Execute("ALTER TABLE [myTable] ALTER COLUMN [Column3] text(20);",,128)

HTH