The size of PST files matters a lot. The PST storage capacity has certain limitation and that limitation is greatly affected by PST file size. For hefty PST file, there are chances that it may get corrupt. Therefore, the best thing is to split the PST file without affecting the content. To split large sized PST files, it is recommended to install PST splitting tool. For more details, visit: www.outlooktools.org/pst-split.html.