The nonlocal boundary value problem, $v'(t)+ Av(t)= f(t)(0\leq t\leq 1),v(0)= v(\lambda)+\mu(0 < \lambda\leq 1)$ , in an arbitrary Banach space $E$ with the strongly positive operator $A$ , is considered. The coercive stability estimates
in Hölder norms for the solution of this problem are proved. The exact
Schauder’s estimates in Hölder norms of solutions of the
boundary value problem on the range $\{0\leq t\leq 1,x\in\mathbb{R}^n\}$
for $2m$ -order multidimensional parabolic equations are obtaine.